Force python3 to be used in build
Force python3 to be used in build

Bug:  none
Change-Id: I17905932cd7b15ec30ab8283c114bf3553c64daf
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2828111
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Reviewed-by: Dirk Pranke <6693ee08b084bb2ffa767f664c99b689395e0e4b@google.com>
Commit-Queue: Philip Pfaffe <639a645feae3653b7aaefa0387217d375f2f82ff@chromium.org>

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